Patent US3751192A successfully refreshed from Google Patents.
US3751192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submersible pump drive system
Assignee: Centrilift Hughes Inc
•
Filing: 1971-04-12
•
Granted: 1973-08-07
•
Expires: 1991-04-12
Abstract
Abstract A pump is coupled with a motor in a deep well to remove fluid of variable density. The downhole motor is energized from an electrical generator which produces substantially constant volts/hertz output energy. The generator has an input shaft to which a constant torque is applied from a variable drive unit. As the fluid becomes lighter, the downhole motor speeds up and the generator produces an increase in both frequency and voltage amplitude to maintain system efficiency.
Inventors
- 👤 C Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:18
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/128; H; H02; H02P; H02P25/00; H02P25/16; H02P25/30; H02P29/00; H02P29/0016; H02P29/0027
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
An energizing system in which an electrical motor is coupled to a pump for pumping fluid of varying density, comprising: an electrical generator connected to supply energy over a cable to the motor, such that the voltage amplitude is always maintained with a substantially constant ratio to the frequency of the energy supplied; and means coupled to the input shaft of the generator, for supplying input mechanical energy at a substantially constant torque level to the generator, allowing the generator to produce an increased output voltage at an increased frequency as the pump speeds up when the fluid becomes less dense.
Claim 2
Dependent Claim
101 words
An energizing system in which an electrical motor is coupled to a pump for pumping fluid of varying density, comprising: an electrical generator connected to supply energy over a cable to the motor, such that the voltage amplitude is always maintained with a substantially constant ratio to the frequency of the energy supplied; and means coupled to the input shaft of the generator, for supplying input mechanical energy at a substantially constant torque level to the generator, allowing the generator to produce an increased output voltage at an increased frequency as the pump speeds up when the fluid becomes less dense.
Claim 3
Dependent Claim
37 words
An energizing system as claimed in claim 1, in which the pump and the electrical motor are disposed in a well, and a conduit provided to remove the fluid from the well as the pump is driven.
Claim 4
Dependent Claim
48 words
An energizing system as claimed in claim 1, in which the means for providing a constant torque on the generator input shaft includes a variable speed drive arrangement connected to the input shaft, and a drive means is connected to supply energy to the variable speed drive arrangement.
Claim 5
Dependent Claim
35 words
An energizing system as claimed in claim 3, in which the variable speed drive arrangement includes an adjustment setting for establishing the level of torque to be supplied over the input shaft to the generator.
Claim 6
Independent Claim
139 words
A system for moving a fluid of variable density from a deep well position through a conduit to a surface location, including: a pump positioned in the well and coupled to the conduit to remove the fluid as the pump is driven; a first electrical motor positioned in the well, and coupled to the pump fOr driving the pump when the motor is energized; an electrical generator having an input shaft, positioned at the surface location and coupled to the first motor over an electrical cable to energize the motor, such that the generator output voltage supplied to the motor has a substantially constant amplitude/frequency ratio over the generator operating range; a variable drive unit, coupled to the generator input shaft for displacing the shaft at a constant torque; and means for supplying energy to the variable drive unit.
Claim 7
Independent Claim
139 words
A system for moving a fluid of variable density from a deep well position through a conduit to a surface location, including: a pump positioned in the well and coupled to the conduit to remove the fluid as the pump is driven; a first electrical motor positioned in the well, and coupled to the pump fOr driving the pump when the motor is energized; an electrical generator having an input shaft, positioned at the surface location and coupled to the first motor over an electrical cable to energize the motor, such that the generator output voltage supplied to the motor has a substantially constant amplitude/frequency ratio over the generator operating range; a variable drive unit, coupled to the generator input shaft for displacing the shaft at a constant torque; and means for supplying energy to the variable drive unit.
Claim 8
Dependent Claim
28 words
A system as claimed in claim 5, in which the variable drive unit includes means for adjusting the level of the torque transferred to the generator input shaft.
Claim 9
Dependent Claim
41 words
A system as claimed in claim 5, in which a second motor is connected to supply energy to the variable drive means, and electrical energy is supplied to the second motor to drive the input shaft of the variable drive means.
References Cited (Backward Citations)
GB265988A
Cited
US3226619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |